What s the difference between atmospheric pressure and atmospheric pressure, please, 3Q

The Earth's surface is covered with a thick atmosphere made up of air. Objects in the atmosphere are subjected to the pressure generated by the impact of air molecules, and this pressure is called atmospheric pressure. It can also be thought of as atmospheric pressure as the pressure that an object in the atmosphere is exerted on an object by the gravity of the atmosphere itself.

Due to gravity, close to the earth's surface, the earth's attraction is high, the density of air molecules is high, and the frequency of hitting the surface of the object is high, and the resulting atmospheric pressure is large. Far from the Earth's surface, the Earth's attraction is small, the density of air molecules is low, and the frequency of hitting the surface of the object is also low, resulting in less atmospheric pressure. Therefore, the atmospheric pressure at different altitudes on Earth is different, and the higher the position, the lower the atmospheric pressure.

In addition, the temperature and humidity of the air also have an effect on the atmospheric pressure. In physics, the perennial mean atmospheric pressure at sea level at a latitude of 45 degrees (i.e., the pull-out altitude is zero) is defined as 1 standard atmosphere (atm). This standard atmospheric pressure is a certain value.

Its value is 1 standard atmosphere = 760 mm Hg = engineering atmospheric pressure = x 10 to the 5th power Pa - Atmospheric pressure refers to the pressure generated by the air at a certain location on the earth The air on the surface of the earth is affected by gravity, resulting in atmospheric pressure The density of the air layer above the earth is not equal, the air near the surface layer is denser, and the air in the upper layers is thinner and less dense Since the atmospheric pressure is generated by the gravity of the air, where the height is large, the height of the air column above it is small, and the density is also small, So the higher the distance from the ground, the smaller the atmospheric pressure Normally, below 2 km, for every 12 meters of altitude, the atmospheric pressure decreases by 1 millimeter of mercury Gases and liquids are fluid, and their pressures are similar, the atmospheric pressure is in all directions, and the atmospheric pressure in all directions is equal in the same position. However, because the density of the atmosphere is not uniform, the liquid pressure formula cannot be applied to the calculation of atmospheric pressure The pressure of a gas that is sealed in a container is generated by the continuous collision of a large number of gas molecules in irregular motion against the wall of the container, and its magnitude is not determined by the gravity of the gas being enclosed

Hello, glad to answer for you! In physics, atmospheric pressure is generally not talked about, because the force acting perpendicular to the unit area of the object is called pressure, and the gas is erratic, and the pressure is naturally not a fixed value, which is not easy to calculate. And we know that the magnitude of the pressure on the unit area of the object is called pressure, and the standard atmospheric pressure can be calculated by the formula, that is, the pressure is taken to the fifth power of 1 10 pa, and the concept of atmospheric pressure is not used in physics.

Classmates, I think you should first understand the concept of pressure and pressure, then this problem will be solved hehe.

<>1. Atmospheric pressure: atmospheric pressure is the atmospheric pressure acting on the unit area, that is, the gravitational force that is numerically equal to the vertical air column that extends upward to the upper boundary of the atmosphere on the unit area.

2. The air pressure generated by the atmosphere on the objects immersed in it is called atmospheric pressure, referred to as atmospheric pressure or air pressure. In 1654, Glick conducted the famous Magdeburg hemispheric experiment in Magdeburg, Germany, which strongly proved the existence of atmospheric pressure, which gave people a deep understanding of atmospheric pressure.

<>1. Atmospheric pressure: The atmospheric pressure of the bucket is the atmospheric pressure acting on the unit area, that is, the gravity of the vertical air column that extends upward to the upper boundary of the atmosphere on the unit area, the famous Magdeburg hemispheric experiment proves its existence, and the international unit of air pressure is Pascal, referred to as Pascal.

2. Atmospheric pressure: The pressure generated by the atmosphere on the object immersed in it is called atmospheric pressure, referred to as atmospheric pressure or air pressure. In 1654, Glick conducted the famous Magdeburg hemispheric experiment in Madsunmoburg, Germany, which strongly proved the existence of atmospheric pressure, which made people have a deep understanding of atmospheric pressure.

Atmospheric pressure is not gas pressure.

1. The concept is different.

Atmospheric pressure: Refers to the pressure of the air on the earth's surface (or at that time).

Gas pressure: refers to the pressure of gas in a certain space (or in a certain container).

2. The generation principle is different.

Atmospheric pressure: Barometric pressure is the atmospheric pressure acting on a unit area, that is, the gravitational force exerted on a vertical column of air that extends upward to the upper boundary of the atmosphere per unit area.

Gas pressure: Gas pressure is the hydrostatic pressure applied to a certain point, and the gas pressure is caused by the continuous and irregular impact of a large number of gas molecules on the container wall.

Atmospheric pressure and pressure are containment relations, and pressure contains atmospheric pressure.

Differences: 1. Different objects.

Atmospheric pressure refers to the pressure of the atmosphere.

Pressure refers to all ranges, large ranges.

2. The commonly used units are different.

The normal and positive pressure of the atmosphere is measured in pascals, kilopascals, bars (bar, 1 bar = 100,000 pascals) and millimeters of mercury.

The common units of pressure are Pa and kPa.

3. The reasons for the formation are different.

Atmospheric pressure is caused by the constant movement of atmospheric molecules.

Pressure is formed by the action of an object on another object.

Atmospheric pressure (atmospheric pressure) generally refers to air pressure, which is the atmospheric pressure acting on a unit area, that is, the gravitational force exerted on a vertical column of air that extends upward to the upper boundary of the atmosphere per unit area. The famous Magdeburg hemispheric experiment proves its existence.

In meteorology, people generally use kilopascals (kpa) or hectopa (hpa) as the unit. Other commonly used units are: bar (1 bar = 100,000 Pa) and centimeters of mercury (or centimeters of mercury).

Air pressure varies not only with altitude but also with temperature. Changes in air pressure are closely related to weather changes.

Atmospheric pressure and atmospheric pressure are the same thing, there is no difference. Barometric pressure is the atmospheric pressure acting on a unit area, i.e. numerically equal to the gravitational force exerted on a column of vertical air that extends upwards to the upper boundary of the air per unit area. The famous Magdeburg hemispheric experiment proves its existence.

The international unit of air pressure is Pascal, abbreviated as Pa, and the symbol is Pa.

Abbreviation for atmospheric pressure. is the atmospheric pressure acting on a unit area, i.e., equal to the weight of the vertical column of air per unit area that extends upwards to the upper boundary of the atmosphere. The magnitude of the air pressure is related to conditions such as altitude, temperature, etc.

Generally, it decreases with increasing height. In the horizontal direction, the difference in atmospheric pressure causes the flow of air. The unit of air pressure is dismantling, and it is customary to use the height of the mercury column.

For example, a standard atmospheric pressure is equal to the weight of a 760 millimeter-high column of mercury, which is equivalent to the atmospheric pressure of a kilogram on an area of one square centimeter. Internationally, it is stipulated that "hecpascal" is used as the unit of air pressure. After conversion:

One standard atmosphere = 1013 hPa (millibar). The average annual air pressure in Shenzhen is 10 pascals.

According to the theory of molecular dynamics, the pressure of a gas is caused by a large number of molecules frequently colliding with the walls of the container. The collision time of a single molecule on the container wall is extremely short, and the effect is not continuous, but a large number of molecules frequently collide with the vessel wall, and the force on the vessel wall is continuous and uniform, and the ratio of this pressure to the area of the vessel wall is the pressure strength is small.